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The nydus network is a nest-like structure, made available to a zerg colony once it has upgraded into a lair. It spawns nydus worms, and it is inside these structures that the worms dwell.[1] It directs peristaltic motion and chemical stimuli to the worms as a form of control, and provides nourishment for the worms.[2] Nydus networks evolved from a combination of nydus canals and the will of broodmothers to gain a surprise attack option. When activated by chemical stimuli, nydus networks form tunnels underground across the battlefield.[3]

The following section contains information from a previous version of StarCraft II which is no longer valid.

The former nydus warrens

The network used to be called the "nydus warren". The warren was needed to build and research abilities for the infestor.[4] However, this function has been moved to the infestor pit.[5]
The queen's nest model from StarCraft was used as a placeholder for the nydus warren.[6]
Allies were once able to enter another player's nydus network, however allied zerg networks would not be linked[7]

↑"The green spidery-like building on the top left is the new art for the Baneling Nest, the prerequisite building to morph Zerglings into Banelings. The new art in the middle is the Infestor Pit, which allows Infestors to be built. Infestor upgrades are also available at that building."Karune. 2008-06-17. Re: Planetary Update: Char (page 2). Battle.net StarCraft II General Discussion Forum. Accessed 2008-06-17.